Aspect Ratio Matrix for Paid Social: Which Ratio, Which Placement
A decision matrix for 9:16, 4:5, 1:1 and 16:9 in paid social: which ratio fits which placement, how much frame you lose converting between them, and how many exports you actually need.
Picking an aspect ratio isn't a style choice — it decides how much of the screen you own and how much of your frame survives the crop. This sheet lays out which ratio belongs on which placement, exactly how much frame you lose converting between ratios, and the smallest export set that still covers every surface.
Aspect ratio is a screen-real-estate decision, not a taste decision
A 9:16 video in a full-screen Reels or TikTok surface owns 100% of the viewport. A 16:9 video wedged into that same surface gets letterboxed down to roughly 42% of the screen, with the rest sitting empty or covered by UI. That gap alone is enough to tank hook rate before the creative even gets judged — the algorithm and the viewer both read a small, letterboxed frame as lower-effort. Ratio is the first lever, before hooks, before copy.
Every crop has a loss number, and some are brutal
Converting a vertical 9:16 master down to a square 1:1 crop loses about 44% of your vertical frame — manageable if your subject is centered. Converting a landscape 16:9 source into a vertical 9:16 crop loses roughly 68% of the frame width, because you're carving a narrow vertical strip out of a wide shot. That's why a video shot horizontally almost never survives being repurposed vertically without a full reframe or reshoot — the math is against you before you start editing.
You need fewer exports than you think
Three renders cover roughly 95% of paid social placements: 9:16 for TikTok, Reels, Stories and Shorts; 4:5 for Meta feed; 1:1 as a fallback for feed and marketplace surfaces. A fourth 16:9 export only earns its place if you're running YouTube in-stream or connected TV. Everything else is a derivative crop of one of those three masters, not a new shoot. Klip Kanvas renders the 9:16, 4:5 and 1:1 set automatically from one product URL, so the export tree is a non-issue rather than a production step.
How the tables below are organized
The locked tables cover four things: a placement-by-placement ratio decision matrix, the percentage of screen each ratio actually fills, a full crop-loss table for converting between ratios, and the minimum export plan by budget. Use the decision matrix first to pick your primary ratio, then check the crop-loss table before you decide whether to derive a size or reshoot it.
4 tables: placement-by-placement ratio decision matrix, screen real-estate by ratio, full crop-loss percentages between 9:16/4:5/1:1/16:9, and the minimum export plan.
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